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Date: Fri,  1 Jul 2011 13:51:26 -0400
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Subject: Re: [9fans] why not halt in x86 multicore
From: Russ Cox <rsc@swtch.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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On Fri, Jul 1, 2011 at 1:47 PM, Ali Mashtizadeh <mashtizadeh@gmail.com> wrote:
> The hlt instruction on x86 leaves the halt state after an external
> interrupt is fired. I'm not sure why you think it doesn't work?

he didn't say it didn't work.
he said it required waiting for the next interrupt,
of which the only guaranteed one is the next
clock interrupt, which might be a long time coming.

interprocessor interrupts are the obvious solution
but no one has bothered to implement them.